I have problems. Ian also having a hard time getting my head around cellars.
Can you enter a cellar from the non cellar location of an adjacent hex? Eg in the advance phase? Canyou lay a dc in a cellar from there?
Units in a cellar are treated as entrenched at ground level. Los exists from the cellar out along ground level until it encounters an obstacle ie the plateau effect does not operate.
I'm in a cellar with an enemy unit adjacent at ground level and in the adjacent cellar. Does "upper level encirclement" apply. Wod it matter if the cellar is fortified?